Annotation Type Version

Specifies the version field or property of an entity class that
serves as its optimistic lock value. The version is used to ensure
integrity when performing the merge operation and for optimistic
concurrency control.

Only a single Version property or field
should be used per class; applications that use more than one
Version property or field will not be portable.

The Version property should be mapped to
the primary table for the entity class; applications that
map the Version property to a table other than
the primary table will not be portable.

The following types are supported for version properties:
int, Integer, short,
Short, long, Long,
java.sql.Timestamp.